[nibnalin]

I think the point of the conversation is also to point out that if there is no fear of death, and population keeps growing, it is possible that quality of life of average humanity goes down.

Of course, multiple factors can contribute to that, including induced "laziness" in large sections of society due to infiniteness of life.

[nshepperd]

Population growth is driven by birth rate, not death rate. Even slaughtering everyone at the age of 100 only delays the overpopulation problem (by less than two decades) if indeed there is an overpopulation problem.